1. Prevention of prematurity;FUCHS, F.;Am] Obstet Gynecol,1976
2. Contribution of preterm delivery to perinatal mortality;W, R.U.S.H.R.;Br Med],1976
3. Risk factors accounting for racial differences in the rate of premature birth;LIEBERMAN, E.;N Engl] Med,1987
4. Social adversity, low birth weight, and preterm delivery;STEIN, A.;Br Med],1987
5. Coitus and associated amniotic-fluid infections;NAEYE, R.L.,1979